摘要
利用工业CT对自然煤岩样进行断层扫描观测。针对煤岩裂隙系统的多尺度、各向异性特征,应用Canny算子图像分割与方向性边缘检测技术,提取煤岩CT图像割理的总体特征、水平方向和垂直方向特征;根据特征图像计算了煤岩样的总体分形维数、孔隙度,各向异性分形维数与孔隙度及其在三维空间中的分布;讨论了分形维数与孔隙度、渗透率之间的关系,并根据煤岩样的分形维数、孔隙度对实际工程岩体的孔隙度和渗透率进行了外推计算。研究表明,煤岩样不同扫描断面的分形维数和孔隙度不同,同一煤样同一断面不同方向的分形维数与孔隙度亦不相同。利用图像分割与边缘检测对工业CT图像进行分析,可以对煤岩的各向异性分形维数与孔隙度在2D与3D空间进行精细描述。
Observations were made on natural coal and rock samples by X-ray tomography to examine the multi-scale anisotropic characteristics of fractures. Canny edge detector and directional line detectors were employed to segment the CT images. As a result, the overall features, the horizontal and the vertical features of the macro- and mini-fractures were extracted, from which the overall and anisotropic fractal dimensions and porosities, as well as its 3D distribution, were calculated. In addition, the relationship among fractal dimension, porosity and permeability, together with its extrapolation to real engineering rock mass, were discussed. The study showed that the fractal dimensions and porosities were different with variations of the scanning sections, and with different directions of same section for the coal and rock samples. Detailed descriptions were made in 2D and 3D space on anisotropic features, porosity and permeability for coal and rocks.
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2009年第6期14-18,共5页
Coal Geology & Exploration
基金
教育部创新群体基金项目(IRT0605)
关键词
工业CT
图像分割
各向异性
分形维数
孔隙度
industrial computed tomography
image segmentation
anisotropy
fractal
porosity
